The potential for serious and fatal wounds by tear-gas pen guns firing both conventional tear-gas and fixed metallic ammunition has been extensively studied and reported by Stahl, Jones, and others [1–5]. The case reported here involves the “weapon as missile” and illustrates an additional potential for injury or fatality to the shooter when these weapons are loaded with metallic ammunition. This case is mentioned in passing by Jones [3], but to our knowledge no similar case has been fully reported.